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Paper Abstract and Keywords
Presentation 2007-11-22 15:25
Low reflection print dipole array antenna used in microwave imaging of biological objects in 1-2GHz/2-3GHz ranges
Naoyuki Iwata, Michio Miyakawa, Nozomu Ishii (Niigata Univ.) MBE2007-67
Abstract (in Japanese) (See Japanese page) 
(in English) In microwave imaging of biological objects, array antennas are desired for efficient- and swift-data acquisition. We have fabricated several kinds of dipole array antennas for microwave imaging of a human body by Chirp Pulse Microwave Computed Tomography (CP-MCT). Those antennas are consisted of more than 30 small dipole antennas so printed on a dielectric board as to construct a fan beam-type receiving antenna. The problem of such printed antennas is high return loss nature in high loss liquids such as a saline solution. We have tried to reduce the return loss by achieving the impedance matching between the antenna-conductor and surrounding saline solution (high-loss liquid) by covering the conductor with the same dielectric material as the printed dielectric board. The sandwiched dipole antenna works properly as we expected, but mutual coupling effects among adjacent dipole antennas have to be minimized for tomographic imaging. We have solved this problem by covering all the antenna conductors with small- and separate –dielectric substrates. Return loss of the sandwiched dipole antenna was reduced by more than 10dB as compared to conventional printed dipole antennas.
Keyword (in Japanese) (See Japanese page) 
(in English) Microwave imaging / Return Loss / Antenna / Loss Medium / / / /  
Reference Info. IEICE Tech. Rep., vol. 107, no. 351, MBE2007-67, pp. 21-24, Nov. 2007.
Paper # MBE2007-67 
Date of Issue 2007-11-15 (MBE) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
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reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
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Conference Information
Committee MBE  
Conference Date 2007-11-22 - 2007-11-22 
Place (in Japanese) (See Japanese page) 
Place (in English) Faculty of Engineering, Tohoku Univ. 
Topics (in Japanese) (See Japanese page) 
Topics (in English)  
Paper Information
Registration To MBE 
Conference Code 2007-11-MBE 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Low reflection print dipole array antenna used in microwave imaging of biological objects in 1-2GHz/2-3GHz ranges 
Sub Title (in English)  
Keyword(1) Microwave imaging  
Keyword(2) Return Loss  
Keyword(3) Antenna  
Keyword(4) Loss Medium  
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1st Author's Name Naoyuki Iwata  
1st Author's Affiliation Niigata University (Niigata Univ.)
2nd Author's Name Michio Miyakawa  
2nd Author's Affiliation Niigata University (Niigata Univ.)
3rd Author's Name Nozomu Ishii  
3rd Author's Affiliation Niigata University (Niigata Univ.)
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Speaker Author-1 
Date Time 2007-11-22 15:25:00 
Presentation Time 25 minutes 
Registration for MBE 
Paper # MBE2007-67 
Volume (vol) vol.107 
Number (no) no.351 
Page pp.21-24 
#Pages 4 
Date of Issue 2007-11-15 (MBE) 

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